class Settings():
	"""存储《外星人入侵》的所有设置的类"""

	def __init__(self):
		'''初始化游戏的设置'''
		#屏幕设置
		self.screen_width = 1200;
		self.screen_height = 800;
		self.bg_color = (230,230,230);
		
		#飞船的设置
		self.ship_speed_factor = 1.5;
		
		#子弹设置
		self.bullet_speed_factor = 1;
		self.bullet_width = 3;
		self.bullet_height = 15;
		self.bullet_color = 60,60,60;
		self.bullets_allowed = 4;